Vellore Institute of Technology (VIT) is a private university located in&nbsp;Tamil Nadu, India. Founded in 1984, as Vellore Engineering College, the institution offers 20 undergraduate, 34 postgraduate, four integrated and four research programs. It has campuses in Vellore, Amravati, Bhopal and Chennai.

VIT is one of the top ranked private universities in India according to NIRF, THE and QS Rankings.&nbsp;Govt. of India has recognized&nbsp;VIT, Vellore as an&nbsp;Institution of Eminence. This has allowed VIT to take independent quality initiatives and move up in world ranking.

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VIT University

The IP Multimedia Subsystem (IMS) is the basis for a significant new architecture for mobile applications incorporating voice, video and data services. The IMS is an overlay network on top of IP that uses SIP as the primary signalling mechanism[1]. Femtocells are low-power wireless access points that operate in licensed spectrum to connect standard mobile devices to a mobile operator’s network using residential DSL or cable broadband connections". Put simply, a femtocell is a small base station that can be deployed in homes, buildings or other locations that offer limited access to the mobile network. In current scenario Mobile services have gained a reputation for inadequate building penetration, resulting in inferior call quality. This quality issue becomes even more paramount as mobile subscribers begin using advanced services available in 3rd Generation (3G) networks, as nearly 70% of all 3G traffic originates from indoor locations. However, research shows that only two per cent of buildings are currently equipped with purpose-built indoor coverage solutions. With the growing demand for these new services, most industry observers see significant potential for the use of new technology in the form of "femtocell” solutions. Femtocells operate in the same wireless spectrum as the macrocell network, enabling high quality voice and multimedia services to be delivered to mobile devices in indoor settings[14]. A femtocell access point creates a small wireless coverage area, and it is attached to a subscriber's broadband Internet service for connection to the mobile operator. In this paper, Configuring the IMS framework in new approach of network architecture such as femtocell and designing the femtocell network to support IMS services is quite demanding. In this paper we concern on the investigation architecture of integration network and what are all the challenges, what are the problems and solution if that, when it works on environment. The deployment of IMS functionality in femtocell environment is investigated and overviewed to achieve high-quality voice, data, and video sessions to flow efficiently, securely and reliably using the consumer’s existing broadband connection. © Research India Publications.

Department of Embedded Technology

School of Electronics Engineering

Vellore Campus

Department of Communication Engineering

International Journal of Applied Engineering Research

Review on integration of IP multimedia subsystem with fem to cells network

The IP Multimedia Subsystem (IMS) is a network architecture that consists of different network elements linked by standard interfaces. It facilitates the delivery of multimedia services based on Internet Protocol (IP) and makes the integration of services with the internet much easier. It is a method to achieve the convergence of fixed and mobile communication devices. Optimized transmission of voice, data and video communications among the users can be achieved using IMS architecture, independent of the user’s location and devices. IMS enables the user to use different services in a more efficient way in terms of energy saving. Using this technology, it is possible to make the network distribution in a better way. It reduces the energy consumption because of the capability to switch network whenever possible. This paper focuses on establishment of end to end session between two IMS terminals and analysing the performance for different applications. The performance is measured on the basis of traffic parameters and call setup delay. We have compared Inter and Intra IMS network based on a model that ensures the delivery of services without any data loss and with minimum delay.

VIT Unitversity

Department of Instrumentation

School of Electrical Engineering

Fulltext

Journal of Green Engineering

Performance Analysis of Inter and Intra IMS Network

The Spectrum Management schemes currently in use overlook the need for interference measurements at the receiver end. The negligence culminates in an underwhelming performance of the Cognitive Radio Network (CRN) due to the presence of hidden/exposed primary senders. Our aim was to implement the RAP framework for spectrum management in a cognitive Radio. The scheme chosen deems it a necessity to take into consideration the inaccuracy of spectrum sensing in order to achieve the desired optimal performance. Unlike the widely used schemes which solely depend on local interference measurements, the proposed probabilistic framework aims at enhancing the CRN good put by incorporating interference measurements performed at the receiver into theprotocol. Moreover, the spectrum management scheme, discussed in the study, makes most of the least exploitable spectral opportunities by relying on low power rate communication robust to interference. The issued spectrum access policy ensures fair distribution of spectral opportunity to its multiple secondary users. It, in contrast to the existing greedy spectrum access policies, prevents any user from monopolizing the available spectral opportunity as it is regulated and operated in a strictly probabilistic framework. It also diligently makes useful, provisions in the policy to ensure that every spectral opportunity, even while being exploited, appear available at all times to see to it that no Secondary User (SU) misidentifies the spectral opportunity as unavailable. © Maxwell Scientific Organization, 2014.

World University root node

Research Journal of Applied Sciences, Engineering and Technology

RAP Framework for Spectrum Management in Cognitive Radio

Energy consumption is a critical issue for battery-powered mobile devices in ad hoc networks. Ad hoc wireless networks are power constrained since nodes operate with limited battery energy. If the routing protocol is not power aware, nodes simply get drained out of energy not being able to send, receive or forward packets to the destinations, thus degrading the performance of the network and network lifetime. Thus, routing protocols should be designed along with features of power aware protocols. This paper presents 'Span' a power aware protocol which is exploited by the routing protocols to increase the lifetime of networks. © 2005 - 2013 JATIT &amp; LLS. All rights reserved.

Journal of Theoretical and Applied Information Technology

Increasing the lifetime of MANETs by power aware protocol - Span

Femtocell handover is more exigent than normal macrocell cellular handover because the backhaul network is different and there is also little possibility of direct communication between the macrocell and the femtocell. In this paper we have analysed the prevailing handover strategy, where Femtocell deployed in LTE Network and a new handover strategy between macrocell and femtocell for LTE-based network in hybrid access mode named RWTL-HO algorithm has also been proposed. This new strategy can avoid unnecessary handover and reduce handover failure. © 2005 - 2012 JATIT &amp; LLS. All rights reserved.

Handover problem for integrating LTE with femtocell network

More than 23% of annual vehicle accidents are rear-end collisions, this gives an important test-case for enhanced collision avoidance approaches based on v2v wireless communications. V2V wireless network concern with the impact of a IEEE 802.11 based multi-hop MAC protocol that propagates an emergency warning message (EWM) down a platoon of cars on a highway. The design objective is to ensure reception of this message with stringent delay constraints so as to provide drivers with requisite available manoeuvre time (AMT) to avoid rear-end collision. This V2V wireless communication protocol provides a realistic simulation in Ns-2 for various topologies (lane-1&amp; lane-3) and the performances were evaluated for different parameters such as EWM delay, delay due to overhead packets and probability of successful delivery of the emergency warning message (EWM). © 2009 IEEE.